Cell cycle indicators of buccal epithelial cells in the treatment of different types of removable plate partial dentures
Keywords:epithelium cells, DNA cytometry, overlay dentures, apoptosis
The purpose of the work. To investigate nuclear DNA and buccal epithelial cells proliferative activity in patients with dental defects, who use removable partial dentures plates made of acrylic or thermoplastic.
Materials and Methods. The study of buccal epithelial cell cycle parameters was carried out in 70 people. Among them 23 patients were treated with acrylic dentures prostheses, 23 patients – with thermoplastic-based prostheses. The comparison group consisted of 24 clinically healthy persons without defects in the dentition. DNA content in human buccal epithelial cells nuclei was determined by flow cytometry.
Results. The obtained indicators of buccal epithelial cell cycle of the control group indicate a high intensity of cell self-renewal in the normal range. It is suggested by a significant percentage of events occurring within the Sub-G1 range that characterizes apoptosis, as well as the fact that more than half of the cells were in the range of S + G2/M. It has been revealed by flow cytometry that the percentage of apoptosis in cells was higher in patients using acrylic dentures base plastic, showed initial signs of keratinization that was confirmed by increase in cells in the range of Sub-G1 and by their decrease in the range of S-G2/M. It has been established in the study of buccal epithelium cell cycle indicators in the dentures bases thermoplastic application that these prostheses did not affect the proliferative activity of buccal epithelial cells compared to the group using acrylic dentures bases with prolonged use. This is evident in almost the same number of cellular events ranging Sub-G1, so apoptosis in the thermoplastic dentures bases application corresponded to the control group indicators both in the early period and over a year of use.
Conclusions. The direct negative effect of prostheses with acrylic bases on the complex mechanism of the oral cavity mucous membrane functioning has been revealed. Absence of dentures bases thermoplastic negative impact on cell cycle gives them a significant advantage over removable plate partial dentures with acrylic bases.
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